protein structure

Question 1

Glycosylation can link a carbohydrate to the following residue via the specified linkage:
a. asparagine (O-linked)

b. threonine (O-linked)

c. cysteine (S-linked)

d. glutamine (N-linked)

e.serine (N-linked)

Answer 1

b

Question 2

Methylation may occur via the NH2 group of

a. lysine
b.asparagine
c.glutamine
d.glutamate
e.histidine

Answer 2

a

Question 3

Glutathione is
a. dipeptide
b. amino acid
c. tripeptide
d. short polypeptide
e. large protein

Answer 3

c

Question 4

The alpha helix
a. may be formed between residues of different polypeptide chains
b. is left-handed
c. contains 6.3 residues per turn
d. forms H bonds between O and H atoms from different peptide bonds
e. has the R groups on the inside

Answer 4

d

Question 5

The hydrogen bond length
a. 2.8Å
b. 0.28μm
c. 28nm
d. 2.8nm
e. 28Å

Answer 5

a

Question 6

Pathogenic prions
a. have a different amino acid sequence to normal prions
b. are produced by the virus that causes CJD
c. polymerise to form fibrils
d. are re-converted to a normal folding by contact with normal prions
e. are more susceptible to proteolysis than normal prions

Answer 6

c